CAD Optimization Suite

Drawing Lag & DWG Performance Cleaner

Solve CAD viewport zoom lag, DWG file size inflation, and extremely slow drawing load times. Interactively generate custom AutoLISP recovery scripts.

DWG Database physical structure purification

DWG Database Structural Purification

LISP compiler

Causing symptoms and cleaning scope

Register Application Cleanup (Regapps)For oversized capacity (hundreds of lines in dozens of lines)MB) Deep cleaning of the drawings.

Reset Scale ListSolve the problem of drawings getting stuck and unresponsive for several seconds when the viewport is zoomed or switched between layouts.

Powerful PURGE redundant garbagePerform three rounds of deep PURGE to clear out irrelevant blocks and empty layers hidden at the bottom.

Database Physical Verification (AUDIT)Check the coordinates of 3D primitive nodes and automatically delete damage, Misplaced malformed data.

Unshelled DGN bloated linear style (DGN Style)Stripping of very large line style dictionaries leftover from MicroStation import.

AutoLISP Macro code real-time compilation

This can be done within CAD as `.lsp` File load or paste and run directly in the command line.

cleandwg.lsp Source code

; ==========================================================
; CADGuide.tools DWG One-click silent cleaning macro for drawing lags (AutoLISP)
; ==========================================================
(defun c:CLEANDWG ()
  (setvar "CMDECHO" 0)
  (setvar "EXPERT" 3)
  (princ "\n--- Start in-depth optimization of the drawing database ---")
  
  (princ "\nSilently clearing remnants of registered applications (Regapps)...")
  (command "-PURGE" "R" "*" "N")
  (princ "\nResetting redundant annotation scale list (Scale List Edit)...")
  (if (dictremove (namedobjdict) "ACAD_SCALELIST")
    (princ "\n✓ The proportion list dictionary was reset successfully.")
    (princ "\n- No redundant scale dictionary detected.")
)
  (princ "\nPerforming three rounds of powerful PURGE to clean up orphaned blocks, Layers and Linetypes...")
  (command "-PURGE" "A" "*" "N")
  (command "-PURGE" "A" "*" "N")
  (command "-PURGE" "A" "*" "N")
  (princ "\nVerifying and fixing drawing database geometry errors (AUDIT)...")
  (command "_AUDIT" "Y")

  (setvar "EXPERT" 0)
  (setvar "CMDECHO" 1)
  (princ "\n==================================================")
  (princ "\n✓ Congratulations! The drawings have been optimized and cleaned up. File size has been significantly reduced.")
  (princ "\n==================================================")
  (princ)
)
(princ "\nLoading successfully! Enter [ CLEANDWG ] and press Enter to perform a deep clean. \n") (princ)

Instructions for use and operation:

Copy the code generated above to create a plain text file on the desktop, Rename to cleandwg.lsp.
Open the drawing that needs slimming and cleaning in AutoCAD, Drag the `cleandwg.lsp` file you just saved into the drawing viewport.
Enter in the CAD command bar: CLEANDWG and press Enter to silently purify and reorganize the drawing database.
Lazy solution: You can also directly copy the entire code, at the CAD command line press Ctrl+V Paste and run directly.

Next Steps in Workflow

Recommended Engineering & CAD Utilities

Handpicked companion tools to streamline modeling, calculation, and drafting workflows

Explore Full CAD Toolbox

Size Reducer

DWG Bloat & File Size Reducer

Diagnose 50MB+ bloated AutoCAD DWG files and purge orphaned DGN linetypes & RegApps.

Launch Utility→

Size Optimizer

STEP Assembly Defeature & Size Optimizer

Calculate 3D STEP/SLDASM file size reduction by stripping internal hardware and threads.

Launch Utility→

ROI & TCO

5-Year CAD Subscription vs. Perpetual TCO

Compare 5-year cumulative SaaS rental costs vs. one-time perpetual buyout CAD alternatives.

Launch Utility→

Hardware Guide

2026 CAD Workstation Hardware Spec Matrix

Match your CAD/BIM software and assembly size to optimal CPU single-core GHz, RAM & GPU.

Launch Utility→

Plant & Piping

SmartPlant 3D (SP3D) Piping Cheat Sheet

Searchable PinPoint locks, piping routing hotkeys, and isometric check commands for SP3D.

Launch Utility→

Mesh Reducer

STL / 3MF Mesh Polygon Decimator

Calculate optimal triangle decimation ratios and binary STL byte size for 3D printing.

Launch Utility→